#region License

/* Copyright (c) 2008, Dusty Candland
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 * * Neither the name of Dusty Candland nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#endregion

using System.Collections.Generic;
using System.Globalization;

namespace NS3Library.Amazon
{
    public sealed class UrlBuilder
    {
        private const string AWS_HOST = "s3.amazonaws.com";

        private readonly AwsUrlStyle _style;
        private readonly string _proto;

        public UrlBuilder(AwsUrlStyle style, bool useSsl)
        {
            _style = style;
            _proto = useSsl ? "https" : "http";
        }

        public string Build()
        {
            return Proto() + "://" + AWS_HOST + "/";
        }

        public string Base(string bucketName)
        {
            return Proto() + "://" + Host(bucketName);
        }

        public string Build(string bucketName)
        {
            return Base(bucketName) + "/";
        }

        public string Build(string bucketName, AwsSubResource subResource)
        {
            string url = Build(bucketName);
            if (subResource != AwsSubResource.None)
                url += "?" + subResource.ToString().ToLower(CultureInfo.InvariantCulture);
            return url;
        }

        public string Build(string bucketName, ICollection<string> parameters)
        {
            string url = Build(bucketName);
            if (parameters != null && parameters.Count > 0)
                url += "?" + Join(parameters, "&");
            return url;
        }

        public string Build(string bucketName, string key)
        {
            string url = Base(bucketName) + "/" + key;
            return url;
        }

        public string Build(string bucketName, string key, AwsSubResource subResource)
        {
            string url = Build(bucketName, key);
            if (subResource != AwsSubResource.None)
                url += "?" + subResource.ToString().ToLower(CultureInfo.InvariantCulture);
            return url;
        }

        public string Build(string bucketName, string key, ICollection<string> parameters)
        {
            string url = Build(bucketName, key);
            if (parameters != null && parameters.Count > 0)
                url += "?" + Join(parameters, "&");
            return url;
        }

        public static string Join(IEnumerable<string> items, string delimiter)
        {
            string result = string.Empty;

            foreach (string item in items)
                result += item + delimiter;

            if (result.Length > 0)
                result = result.Substring(0, result.Length - delimiter.Length);
            return result;
        }

        public string Host(string bucketName)
        {
            if (_style == AwsUrlStyle.Path)
                return AWS_HOST + "/" + bucketName;
            else if (_style == AwsUrlStyle.CName)
                return bucketName;
            return bucketName + "." + AWS_HOST;
        }

        public string Proto()
        {
            return _proto;
        }
    }
}